Paper bag



H. A. GRANT May 24, 1932.

PAPER BAG Filed April 16 f 5. n H Rd N Dr R G 0 v N4 A r KGB ITNESSES Patented May 24, 1932 UNITED STATES PATENT OFFICE.

HERBE'BH' A. GRANT, OF NEWARk, NEW JERSEY, ASSIGIN'OR TO MILLER' TOMPKINS &

COMPANY, OF NEW YORK, N. .Y.

, A. CORPORATION OF NEW YORK- PAPER BAG Application filed April 10, 1930. Serial No. 444,786.

to prevent moisture or air from entering the paper bag and injuring products which may be contained therein.

Another object of the invention is to provide a paper bag which becomes tougher when moistened, the moisture serving'to. increase the strength of the paper instead of impairing the qualities thereof which render it.

' tamer was too great to permit of its general 'use and when the bag or container was inex serviceable.

Still another object of the invention is to provide a paper bag having a two-ply body, one ply of the body having the characteristics of a treated kraft paper which has been parohmented.

Additional objects of the invention will appear in the following specification in which the preferred form of the invention is described.

In the drawings similar reference characters refer to similar parts in all the views .of which Figure 1 is a perspective view showing the paper bag,

Fig. 2 is an enlarged sectional view on the line 22,

Fig. 3 is an enlarged sectional view on the line 33, v

Fig. 4 is a sectional view showing a fragmentof the bag in perspective and with the moisture-proof element at the inside of the body of the bag,

Fig. 5 is a perspective sectional view similar to that shown in Fig. 4, but with the moisture-proof element at the outside of the body of "the bag, and

" Figlfi is a sectional view showing a threeply bag with the moisture-proof element dlS- posed' between the inner.and outer body elements.

In storing and selling coal, coke, lime, fertilizers and other products and commodities it is important that an inexpensive bag or container be provided and in many cases it is"n'ecessary that this bag or container be" air tight, moisture tight andwater tightso that the bag or container will preserve the product or commodity and will prevent air or moisture from passing through the bag or container to'damage the bag or .container, or to soil or damage articles adjacentthe place where the bag or container is used or stored.

It is also necessary in mariy cases to prevent air or moisture from passing through the paper bag-to its inner side. 5

Many attempts have been made to supply a container having the desired ualities, ut when a bag or container was ound which Was moisture-proof the cost of the bag or.con

paper is preferably treated to fill or load the pores of the paper and also to ive flexibility. One means of accomplishing t is result takes place in the use of paper from ofiset printing plants, for in carrying on such a printing process the paper receives a wax vapor spray and also coatings of the printing ink conv taining pigments, oils and driers. These coatings load and fill the pores of the paper, as well as serve to soften the paper and render it pliable," and v also to toughen the paper which quality is emphasized when the paper is moistened. By using this waste paper from'ofiset printing plates the expense of the raw material of paper becomes materially reduced.

By referring the drawings it will be seen that the paper bag, 10 has an outer body.

11 which is preferably of heavy and strong paper, the paper bag 10 having an inner lining 12 which is constructefl of paper and preferably of paper which is of the type referred to as parchmented kraft paper. This inner lining 12 is treated to fill or load the,

pores of the paper and the pores of the paper are preferably filled or loaded with wax, pigments, oils and driers.

' Figs. 1, 2, 3 and 4 of the drawings show the parchmented kraft treated paper 12 at the inner side of the body element 11, but it will b be seen by referring to Fig. 5 of the drawings that the parchmented kraft treated paper 12 may be" disposed at the outer side of the body element 11, or if desired, as shown in Fig. 6,

" the parchmented kraft treated paper 12 may be disposed between body elements 13 and a 14 The parchmented kraft treated paper and l the body element or elements 11 are blanked out together and have their edges attached by a waterproof glue, the bag being formed in this way with the parchmented kraft treated paper either at the inner side of the 2 bag or at the outer side, or if desired; in a three-ply bag, between the inner and outer body elements.

What is claimed is: I 1. A multi-ply bag having as one ply a 2 paper base with the characteristics of a parchmented kraft paper and which is coated with wax and printing ink.

2. A multi-ply bag having as one ply a paper base made from elements'having the 80 characteristics of a parchmented kraft paper which is coated with wax and printing ink, the edges of the elements being held together by moisture-proof glue.

3. A multi-ply bag having as one ply a paper base which is coated with waxand printing ink. 4

- HERBERT A. GRANT. 

